大型热水热网两级泵中间定压方式

介绍了定压点设置在两级串联循环泵之间的两级泵中间定压补水方式.结合工程实例,对地形复杂的供热系统,比较了采用旁通管定压补水方式、两级泵中间定压补水方式的运行效果,两级串联循环泵中间定压补水方式的效果更好.     

FORMABILITY OF INTERMEDIATE COMPOUNDS IN OXIDE SYSTEMS OF M_2O_3-M'_2O_3 TYPE

ＦＯＲＭＡＢＩＬＩＴＹＯＦＩＮＴＥＲＭＥＤＩＡＴＥＣＯＭＰＯＵＮＤＳＩＮＯＸＩＤＥＳＹＳＴＥＭＳＯＦＭ２Ｏ３Ｍ′２Ｏ３ＴＹＰＥ①ＷｕＺｈｕ,ＬｉＣｈｏｎｇｈｅ,ＤｅｎｇＨｏｎｇｍｅｉａｎｄＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭ...     

MOLTEN SALT PHASE DIAGRAMS CALCULATION USING ARTIFICIAL NEURAL NETWORK OR PATTERN RECOGNITION BOND PARAMETERSPART 3. ESTIMATION OF LIQUIDUS TEMPERATURE AND EXPERT SYSTEM

１ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｅｘｐｅｒｉｍｅｎｔａｌｄａｔａｏｎｔｈｅｌｉｑｕｉｄｕｓｌｉｎｅｓｏｒｓｕｒｆａｃｅｓｉｎｂｉｎａｒｙｏｒｔｅｒｎａｒｙｓｙｓｔｅｍｓｆｒｏｍｒｅｆｅｒｅｎｃｅｓａｒｅａｌｗａｙｓｆｉｎｉｔｅ．Ｓｏｍｅｔｉｍｅｓｔ...     

Eutectoid transformations accompanied by ordering

Eutectoid transformations accompanied by ordering, unlike ordinary ones, proceed through non-pearlitic modes of transformations. Eutectoid invariants are classified into two categories in binary systems. The eutectoid invariant of A3()→D0₁₉(₂) + L1₀(γ) in the Ti-Al binary system belongs to the first category, in which one product phase has an ordered structure of a parent phase. Its transformation product exhibits a γ/₂ lamellar structure consisting of nearly perfectly aligned alternate lamellae of γ and ₂, which is formed by precipitation of γ plates in either or ₂ matrix with the Blackburn orientation relationship. The eutectoid invariant of A1(γ)→D0₂₂(γ″) + L1₂(γ′) in the Ni₃V-Ni₃Al pseudo-binary system is an example of the second category, in which both product phases have different ordered structures of a parent phase. The transformation of a 75Ni-18V-7Al alloy results in a ‘checkerboard’ pattern consisting of a periodic array of columns of γ′ and two γ″ orientation variants, which are formed by phase separation simultaneous with ordering.     

金相学中杠杆定律的应用

从杠杆定律所揭示的金相图中两相区中的相的成分和其相对量的基本关系,并从相图中多相区(三相及以上相区)相的特征,提出了杠杆定律在多相区的应用并给出了具体例证。为用杠杆定律定量分析多相区相图,提供了理论依据。     

以改进的“中心原子”模型计算Ag—Cu相图

简化并推导了“中心原子”模型公式,使其在形式和参数意义上更接近普通热力学计算相图公式。在新模型中,Ａ－Ｂ二元系合金第ｉ个原子态Φ＾αｉ状态量与组态Φ＾α０的状态量之差（φ＾αｉ－φ＾α０）不必与（φ＾α１－φ＾φ０）成正比（ｉ表示α原子周转最近邻有ｉ个Ｂ原子）,而各原子态Φ＾αｉ在合金中存在的几率之和Ｐα等于α组元在合金中活度系数的倒数。采用修改后的“中心原子”模型公式计算Ａｇ－Ｃｕ相图及热力学性     

Nd-Fe-B三元系相图的研究 Ⅰ.室温等温截面

观察了Nd-Fe-B三元合金铸态与均匀化处理后的金相组织,并进行了微区成分分析和物相鉴定。确定了Nd-Fe-B成分三角在室温下的各个平衡相区,绘制了该三元系在室温下的等温截面相图。     

PHASE DIAGRAM OF Nd-Fe-B TERNARY SYSTEM——Ⅱ.Two Vertical Sections with Constant Nd and B Respectively,Passing Through Nd_2Fe_(14) B Point

According to the experimental data of phase transition taken from DTA, metallography,SEM and microzone composition, two vertical sections of the ternary phase diagram (B=5.88at.-%, Nd≤45.41 at.-% andNd_2Fe_(14)BNd_(1.1)Fe_4B_4 , B≤44.56 at.-%) have been drawn indetail. It is verified that the crystallization of both Nd_2Fe_(14)B and Nd_(1.1)Fe_4B_4 phase, duringcooling from melt, would take peritectic reaction instead of solid-liquid congruent precipita-tion.     

LIQUIDUS OF SYSTEM Ag-Cu-Ge

The diagram of Ag-Cu-Ge system was constructed from the investigation of 13 internal sec-tions by DTA heating as well as cooling curves in an atomsphere of dry N_2 . The phase dia-gram is subdivided into two pseudo-ternary systems shown as Ag-Cu-Cu_3Ge andAg-Cu_3Ge-Ge. Both systems belong to simple eutectic type. The ternary eutectic points liein." E_1, Ag(22.0)-Cu(58.8)-Ge(19.2), 632℃ and E_2 , Ag(44.3)-Cu(29.5)-Ge(26.2), 533℃.The three side binary systems were redetermined.     

QUASI-EQUILIBRIUM MICROSTRUCTURES AND EFFECT OF ALLOY ELEMENTS IN Fe-Mn-Ni-Cr STEELS

本文利用X射线定量相分析及金相观察和硬度测试,考察了中碳Fe-Mn-Ni-Cr钢的组织及合金元素的作用。建立了经1100℃淬火后的马氏体体积分数与合金成分的定量关系式; f_M~(1100)=162.643-15.482Mn-7.36Ni-4.286(Cr+Mo+V)并在此基础上给出了亚平衡组织图。结果表明,Mn稳定奥氏体的作用大于Ni的作用。Ni和Cr当量分别以[Ni]=2.104Mn+Ni,[Cr]=Cr+Mo+V表示。计算了M_S点处的马氏体相变驱动力,指出Mn具有强烈降低相变驱动力的作用。